3 files changed, 22 insertions, 1 deletions
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index fe21305588..f80f4fada2 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,18 @@
+*   Added method `#eql?` to `ActiveSupport::Duration`, in addition to `#==`.
+
+    Currently, the following returns `false`, contrary to expectation:
+
+        1.minute.eql?(1.minute)
+
+    Adding method `#eql?` will make this behave like expected. Method `#eql?` is
+    just a bit stricter than `#==`, as it checks whether the argument is also a duration. Their
+    parts may be different though.
+
+        1.minute.eql?(60.seconds)  # => true
+        1.minute.eql?(60)          # => false
+
+    *Joost Lubach*
+
 *   Time#change can now change nanoseconds (:nsec) as a higher-precision
     alternative to microseconds (:usec).
 
diff --git a/activesupport/lib/active_support/duration.rb b/activesupport/lib/active_support/duration.rb
index a54494bc65..e861a17426 100644
--- a/activesupport/lib/active_support/duration.rb
+++ b/activesupport/lib/active_support/duration.rb
@@ -57,8 +57,10 @@ module ActiveSupport
       @value.to_s
     end
 
+    # Returns +true+ if +other+ is also a Duration instance, which has the
+    # same parts as this one.
     def eql?(other)
-      other.is_a?(Duration) && self == other
+      Duration === other && other.value.eql?(value)
     end
 
     def self.===(other) #:nodoc:
diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index 555bde6e04..881faf93f5 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -49,9 +49,13 @@ class DurationTest < ActiveSupport::TestCase
                   "which behaves oddly for the sake of backward-compatibility."
 
     assert 1.minute.eql?(1.minute)
+    assert 1.minute.eql?(60.seconds)
     assert 2.days.eql?(48.hours)
     assert !1.second.eql?(1)
     assert !1.eql?(1.second)
+    assert 1.minute.eql?(180.seconds - 2.minutes)
+    assert !1.minute.eql?(60)
+    assert !1.minute.eql?('foo')
   end
 
   def test_inspect